What is the process known in which a megaspore is formed for the megaspore mother cell.

Answer

**Step-by-Step Solution:**

1. **Understanding the Terms:**
- A megaspore is a type of spore that develops into the female gametophyte in seed plants.
- The megaspore mother cell, also known as the megasporangium, is the cell that undergoes meiosis to produce megaspores.

2. **Identifying the Process:**
- The formation of megaspores from the megaspore mother cell is a specific biological process.

3. **Naming the Process:**
- This process is known as **megasporogenesis**.

4. **Role of Megasporogenesis:**
- During megasporogenesis, the megaspore mother cell undergoes meiosis to produce four haploid megaspores. Typically, only one of these megaspores survives and develops into the female gametophyte, which will eventually form the egg cell.

5. **Conclusion:**
- Therefore, the process in which a megaspore is formed from the megaspore mother cell is called **megasporogenesis**.